Laser gain media
The recent progress of the advanced solid-state lasers is based on the
evolution of laser gain media. This figure shows two of the main
directions in this evolution. The first direction indicates the
improvement of the optical gain coefficient of laser media, whichi is the
shift from optically isotropic materials to anisotropic materials. The
second direction is the requirement of the gain media with large optical
apertures that is realized as "ceramic lasers." Therefore the ultimate
laser gain media should be considered to be "anisotropic laser ceramics,"
which is demonstrated by our group for the first time in the world [J.
Akiyama, Y. Sato, and T. Taira, Opt. Lett., 35